SG Series Boilers – Installation and Service Manual
11
If the controller is displaying “
Err” followed by a number, use the error code definitions in the Table 4 to
determine the problem and possible causes.
Table 4 Error Codes
Display State Solution
Err ↔ 2
End switch of venting
damper failed to open
The end switch contacts stuck closed. Check the venting
damper and replace it if necessary.
Err ↔ 4
Low flame current
Check pilot assembly and replace it if necessary.
Err ↔ 6
Flame sensed out of
normal sequence
Flame sensed out of normal sequence (before opening gas
valve or after closing gas valve).
Err ↔18
Gas valve relays
welded 5 consecutive
soft lockouts
A manual reset is required.
Err ↔ 23
Flame sensed during
pre-purge
Flame sensed during pre-purge (before gas valve signaled
opened)
Err ↔ 24
Flame sensed during
post-purge
Flame sensed during post-purge (before gas valve signaled
closed)
Err ↔ 29
End switch of venting
damper failed to close
The end switch contacts stuck open. Check the venting
damper and replace it if necessary.
Err ↔ 32
Sensor error
Temperature sensor or interface failure (open or short
connection, increased connection resistance, dual sensor
mismatch) or failure of A/D conversion (invalid offset or gain,
too many failures during A/D conversion).
Err ↔ 57
Flame rod shorted to
burner ground
Check and adjust or replace if necessary.
Err ↔ 58
AC line frequency error
AC signal is too noisy or frequency is incorrect.
Err ↔ 59
Line voltage error
AC voltage out of specification high or low.
Err ↔ 60
Thermostat input
higher than threshold
Check thermostat wiring and replace it if necessary.
Err ↔ 61
Line voltage unstable
Possibly too many heavy loads switching on and off cause
erratic supply voltage.
Err ↔ 62
Soft lockout
Maximum number of retries exceeded.
Err ↔ 63
Soft lockout
Maximum number of recycles exceeded.
Err ↔ 64
Soft lockout
Internal failure (Electronics failure). Caused by general
electronics failure such as relay open or shorted contacts,
flame sensing circuit error, or A to D error.
Err ↔ 65
Over temperature error
Sensor measured temperature in excess of ECO limit.
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